Results 1 to 2 of 2

Math Help - Mapping (functions)

  1. #1
    Member
    Joined
    Oct 2006
    Posts
    185
    Thanks
    1

    Mapping (functions)

    Find the values of x such that the function f^{2} maps onto g.

    So we need to solve the equation f^{2}(x)=g(x).

    My students asked me why is that the equation to be solved. They don't understand about the "maps onto" part.

    How should I explain this? a simple and straightforward explanation?

    Thanks for sharing
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Sep 2008
    Posts
    28
    I may be off I haven't taken math classes in years, but it seems to me that "maps onto" in this case is another way to say intersects with. As in at what x value do the 2 functions have the same y value. So you set them equal to each other and solve for x.

    "Maps onto" is more useful if talking about 3 dimensions where a 3d object intersects a plane, and leaves what we see as a 2d map when we look at all the points of intersection. Think of a sphere intersection a plane. We would see a map of a circle.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Mapping involving hyperbolic functions
    Posted in the Differential Geometry Forum
    Replies: 6
    Last Post: April 30th 2011, 09:36 PM
  2. mapping
    Posted in the Advanced Applied Math Forum
    Replies: 1
    Last Post: April 10th 2011, 12:14 AM
  3. mapping
    Posted in the Differential Geometry Forum
    Replies: 5
    Last Post: April 5th 2011, 06:16 PM
  4. Complex open mapping & conformal mapping problems.
    Posted in the Differential Geometry Forum
    Replies: 1
    Last Post: February 22nd 2011, 07:26 AM
  5. Help in Mapping..
    Posted in the Advanced Algebra Forum
    Replies: 5
    Last Post: July 2nd 2008, 07:13 PM

Search Tags


/mathhelpforum @mathhelpforum